created hwsauth module

hwsauth/model.go

@@ -0,0 +1,46 @@
+package hwsauth
+
+import (
+	"context"
+	"database/sql"
+)
+
+type authenticatedModel[T Model] struct {
+	model T
+	fresh int64
+}
+
+func getNil[T Model]() T {
+	var result T
+	return result
+}
+
+type Model interface {
+	ID() int
+}
+
+type ContextLoader[T Model] func(ctx context.Context) T
+
+type LoadFunc[T Model] func(tx *sql.Tx, id int) (T, error)
+
+// Return a new context with the user added in
+func setAuthenticatedModel[T Model](ctx context.Context, m *authenticatedModel[T]) context.Context {
+	return context.WithValue(ctx, "hwsauth context key authenticated-model", m)
+}
+
+// Retrieve a user from the given context. Returns nil if not set
+func getAuthorizedModel[T Model](ctx context.Context) *authenticatedModel[T] {
+	model, ok := ctx.Value("hwsauth context key authenticated-model").(*authenticatedModel[T])
+	if !ok {
+		return nil
+	}
+	return model
+}
+
+func (auth *Authenticator[T]) CurrentModel(ctx context.Context) T {
+	model := getAuthorizedModel[T](ctx)
+	if model == nil {
+		return getNil[T]()
+	}
+	return model.model
+}